Update schema doc references to non-deprecated contentTypes id

The org.eclipse.core.runtime.contentTypes extension point was removed
in eclipse-platform/eclipse.platform#1644. Update schema documentation
to reference the non-deprecated org.eclipse.core.contenttype.contentTypes
extension point instead.

Author: vogella

bundles/org.eclipse.core.filebuffers/schema/annotationModelCreation.exsd

@@ -76,7 +76,7 @@
          <attribute name="contentTypeId" type="string">
             <annotation>
                <documentation>
-                  the id of a content type as defined by the &lt;code&gt;org.eclipse.core.runtime.contentTypes&lt;/code&gt; extension point for which this factory should be used
+                  the id of a content type as defined by the &lt;code&gt;org.eclipse.core.contenttype.contentTypes&lt;/code&gt; extension point for which this factory should be used
                </documentation>
             </annotation>
          </attribute>

bundles/org.eclipse.core.filebuffers/schema/documentCreation.exsd

@@ -88,7 +88,7 @@
          <attribute name="contentTypeId" type="string">
             <annotation>
                <documentation>
-                  the id of a content type as defined by the &lt;code&gt;org.eclipse.core.runtime.contentTypes&lt;/code&gt; extension point for which this factory should be used
+                  the id of a content type as defined by the &lt;code&gt;org.eclipse.core.contenttype.contentTypes&lt;/code&gt; extension point for which this factory should be used
                </documentation>
             </annotation>
          </attribute>

bundles/org.eclipse.core.filebuffers/schema/documentSetup.exsd

@@ -80,7 +80,7 @@ As of 3.2, a warning is written to the log file if this isn't followed.
          <attribute name="contentTypeId" type="string">
             <annotation>
                <documentation>
-                  the id of a content type as defined by the &lt;code&gt;org.eclipse.core.runtime.contentTypes&lt;/code&gt; extension point for which this participant should be used.
+                  the id of a content type as defined by the &lt;code&gt;org.eclipse.core.contenttype.contentTypes&lt;/code&gt; extension point for which this participant should be used.
                </documentation>
             </annotation>
          </attribute>

bundles/org.eclipse.ui.workbench.texteditor/schema/rulerColumns.exsd

@@ -144,7 +144,7 @@
    <element name="targetContentType">
       <annotation>
          <documentation>
-            Describes a content type that the column is contributed to. See the &lt;tt&gt;org.eclipse.core.runtime.contentTypes&lt;/tt&gt; extension point. Note that the rulerColumns extension point is typically only supported by line based text editors.
+            Describes a content type that the column is contributed to. See the &lt;tt&gt;org.eclipse.core.contenttype.contentTypes&lt;/tt&gt; extension point. Note that the rulerColumns extension point is typically only supported by line based text editors.
          </documentation>
       </annotation>
       <complexType>